Version 1
: Received: 28 April 2024 / Approved: 28 April 2024 / Online: 29 April 2024 (10:25:29 CEST)
How to cite:
Zhang, D.; Liang, D.; Deng, J.; Liu, Y.; Xie, J. On the Spanwise Periodicity within the Gap between Two Different-Sized Tandem Circular Cylinders at Re=3900. Preprints2024, 2024041868. https://doi.org/10.20944/preprints202404.1868.v1
Zhang, D.; Liang, D.; Deng, J.; Liu, Y.; Xie, J. On the Spanwise Periodicity within the Gap between Two Different-Sized Tandem Circular Cylinders at Re=3900. Preprints 2024, 2024041868. https://doi.org/10.20944/preprints202404.1868.v1
Zhang, D.; Liang, D.; Deng, J.; Liu, Y.; Xie, J. On the Spanwise Periodicity within the Gap between Two Different-Sized Tandem Circular Cylinders at Re=3900. Preprints2024, 2024041868. https://doi.org/10.20944/preprints202404.1868.v1
APA Style
Zhang, D., Liang, D., Deng, J., Liu, Y., & Xie, J. (2024). On the Spanwise Periodicity within the Gap between Two Different-Sized Tandem Circular Cylinders at Re=3900. Preprints. https://doi.org/10.20944/preprints202404.1868.v1
Chicago/Turabian Style
Zhang, D., Yakun Liu and Jialiang Xie. 2024 "On the Spanwise Periodicity within the Gap between Two Different-Sized Tandem Circular Cylinders at Re=3900" Preprints. https://doi.org/10.20944/preprints202404.1868.v1
Abstract
The spanwise periodicity within the gap was observed in the literature, which should be systematically studied in order to ascertain its characteristics and its influences on flow field. By numerically simulating the flow around two tandem circular cylinders with a diameter ratio of d/D=0.6 and seventeen spacing ratios (L/D=1.00~6.00) at Re=3900, this study shows four flow regimes: Reattachment Flow (L/D=1.00~3.15), Bi-stable Flow (L/D=3.24), Intermittent Lock-in Co-shedding (L/D= 3.30~3.50) and Subharmonic Lock-in Co-shedding (L/D=4.00~6.00). Further, depending on the spanwise periodicity length of the time-averaged flow structures (i.e. Pz) within the gap, Reattachment Flow is, for the first time, subdivided into three new sub-flow regimes: Small-scale Periodic Reattachment (L/D=1.00~1.50, Pz/D=(0, 4]), Large-scale Periodic Reattachment (L/D=2.00~2.25, Pz/D>4) and Non-periodic Reattachment (L/D=2.50~3.15, no spanwise periodicity). The formation mechanisms are elaborated by analyzing the combined effect of both the L/D value and the spanwise-averaged time-averaged reattachment angle of the downstream cylinder. Moreover, this study proves that the newly-defined Small-scale Periodic Reattachment and Large-scale Periodic Reattachment are responsible for the pronounced asymmetry of the flow along the transverse direction within the gap. In addition, detailed flow properties and statistical parameters are provided for each flow regime, such as velocity, vorticity, force coefficient, separation/reattachment angle, Strouhal number and Q-criterion.
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
